So I took it to a Goodyear shop that was listed as having a Hunter machine... which charged $30/tire (which is avg by calling around). First did the 2 rears - since the vibration is in the seats, visible shaking too)... and the vibration was still there, a little worse perhaps. Then I had them do the 2 fronts and while it's better, it is still pretty consistent when accelerating through 60mph and upward. It is also there when letting off the gas (no brake) from 80->60mph.

The shop just calibrated their machine yesterday so it's supposed to be really accurate. He put weights in different places (some needed more than others, said it was really off before)... and all 4 tires are now spinning perfectly round, the rims are not out-of-round and the tires look good.

Ideas? I can bring it to the dealer and state the same problem, state they were road-forced, but they will probably ask me to pay their fee to do it again at a much higher price (and still may not fix the problem). I already did a wheel alignment through them. Suspension isn't likely to cause this right?

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr